using System;

/*
 * This file is part of the iText project.
 * Copyright (c) 1998-2009 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * you must retain the producer line in every PDF that is created or manipulated
 * using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */

namespace iTextSharp.text.pdf {

    /**
     * <CODE>PdfResources</CODE> is the PDF Resources-object.
     * <P>
     * The marking operations for drawing a page are stored in a stream that is the value of the
     * <B>Contents</B> key in the Page object's dictionary. Each marking context includes a list
     * of the named resources it uses. This resource list is stored as a dictionary that is the
     * value of the context's <B>Resources</B> key, and it serves two functions: it enumerates
     * the named resources in the contents stream, and it established the mapping from the names
     * to the objects used by the marking operations.<BR>
     * This object is described in the 'Portable Document Format Reference Manual version 1.3'
     * section 7.5 (page 195-197).
     *
     * @see     PdfResource
     * @see     PdfProcSet
     * @see     PdfFontDictionary
     * @see     PdfPage
     */

    internal class PdfResources : PdfDictionary {
    
        // constructor
    
        /**
        * Constructs a PDF ResourcesDictionary.
        */
    
        internal PdfResources() : base() {}
    
        // methods
    
        internal void Add(PdfName key, PdfDictionary resource) {
            if (resource.Size == 0)
                return;
            PdfDictionary dic = GetAsDict(key);
            if (dic == null)
                Put(key, resource);
            else
                dic.Merge(resource);
        }
    }
}
